@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix constant: <http://qudt.org/vocab/constant/> .
@prefix dc: <http://purl.org/dc/elements/1.1/> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix prov: <http://www.w3.org/ns/prov#> .
@prefix qkdv: <http://qudt.org/vocab/dimensionvector/> .
@prefix quantitykind: <http://qudt.org/vocab/quantitykind/> .
@prefix qudt: <http://qudt.org/schema/qudt/> .
@prefix si-quantity: <https://si-digital-framework.org/quantities/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix unit: <http://qudt.org/vocab/unit/> .
@prefix vaem: <http://www.linkedmodel.org/schema/vaem#> .
@prefix voag: <http://voag.linkedmodel.org/schema/voag#> .

quantitykind:StressOpticCoefficient
  a qudt:QuantityKind ;
  dcterms:description "When a ray of light passes through a photoelastic material, its electromagnetic wave components are resolved along the two principal stress directions and each component experiences a different refractive index due to the birefringence. The difference in the refractive indices leads to a relative phase retardation between the two components. Assuming a thin specimen made of isotropic materials, where two-dimensional photoelasticity is applicable, the magnitude of the relative retardation is given by the stress-optic law Δ=((2πt)/λ)C(σ₁-σ₂), where Δ is the induced retardation, C is the stress-optic coefficient, t is the specimen thickness, λ is the vacuum wavelength, and σ₁ and σ₂ are the first and second principal stresses, respectively."^^qudt:LatexString ;
  qudt:applicableUnit unit:BREWSTER ;
  qudt:applicableUnit unit:NanoM-PER-CentiM-MegaPA ;
  qudt:applicableUnit unit:NanoM-PER-CentiM-PSI ;
  qudt:applicableUnit unit:NanoM-PER-MilliM-MegaPA ;
  qudt:applicableUnit unit:PER-MegaPA ;
  qudt:applicableUnit unit:PER-PA ;
  qudt:applicableUnit unit:PER-PSI ;
  qudt:hasDimensionVector qkdv:A0E0L1I0M-1H0T2D0 ;
  qudt:informativeReference "https://en.wikipedia.org/w/index.php?title=Photoelasticity&oldid=1109858854#Experimental_principles"^^xsd:anyURI ;
  qudt:latexDefinition "When a ray of light passes through a photoelastic material, its electromagnetic wave components are resolved along the two principal stress directions and each component experiences a different refractive index due to the birefringence. The difference in the refractive indices leads to a relative phase retardation between the two components. Assuming a thin specimen made of isotropic materials, where two-dimensional photoelasticity is applicable, the magnitude of the relative retardation is given by the stress-optic law $\\Delta ={\\frac {2\\pi t}{\\lambda }}C(\\sigma _{1}-\\sigma _{2})$, where $\\Delta$ is the induced retardation, $C$ is the stress-optic coefficient, $t$ is the specimen thickness, $\\lambda$ is the vacuum wavelength, and $\\sigma_1$ and $\\sigma_2$ are the first and second principal stresses, respectively."^^qudt:LatexString ;
  qudt:plainTextDescription "When a ray of light passes through a photoelastic material, its electromagnetic wave components are resolved along the two principal stress directions and each component experiences a different refractive index due to the birefringence. The difference in the refractive indices leads to a relative phase retardation between the two components. Assuming a thin specimen made of isotropic materials, where two-dimensional photoelasticity is applicable, the magnitude of the relative retardation is given by the stress-optic law Δ=((2πt)/λ)C(σ₁-σ₂), where Δ is the induced retardation, C is the stress-optic coefficient, t is the specimen thickness, λ is the vacuum wavelength, and σ₁ and σ₂ are the first and second principal stresses, respectively." ;
  qudt:qkdvDenominator qkdv:A0E0L0I0M1H0T-2D0 ;
  qudt:qkdvNumerator qkdv:A0E0L1I0M0H0T0D0 ;
  rdfs:comment "Applicable units are those of quantitykind:StressOpticCoefficient" ;
  rdfs:isDefinedBy <http://qudt.org/3.2.1/vocab/quantitykind> ;
  rdfs:label "Stress-Optic Coefficient"@en .